Optical characteristic of PVK/C60 films fabricated by physical jet deposition

We report photoluminescence (PL) and time-resolved PL spectroscopic measurements of PVK/C60 combination film fabricated by a new physical jet deposition technique by which PVK and C60 are deposited as separate or mixed molecular layers resulting in an effective charge transfer between these two kinds of molecules. The decay time of PVK PL emission at 630 nm decreases and that of C60 PL emission around 730 nm increases in both the mixed and multilayer PVK/C60 film compared with those in pure PVK and C60. These results could be explained by the effective charge transfer and excitation transfer processes happening in PVK/C60 combination films.